Even though Twig has been in Drupal 8 for quite some time now, there are still a lot of things left to do! I recently started collaborating with the "Twig team" in an effort to help move Drupal in the right direction.
I took that as a challenge to help make Drupal the leading mobile CMS platform. Certainly, there are some fantastic contributed modules that already make Drupal a great starting point for mobile solutions
So you are interested in Drupal 8, right? I know I am, but with all these fundamental changes, many developers out there (including myself) need to do some serious work adapting their skillset to be able to work with it.